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Thomas J. Kelly J e f f r e y S. Gaffney* M a r y F. Phillips Roger L. Tanner Environmental Chemistry Division Department of Energy and Environment Brookhaven National Laboratory Upton, New York 11973
RECEIVED for review July 19, 1982. Accepted September 27, 1982. Support for this work by the Office of Health and Environmental Research, U.S. Department of Energy, is gratefully acknowledged. This work was performed under the auspices of the U.S. Department of Energy under Contract NO. DE-AC02-76CH00016.
Identification of Triaromatic Azaarenes in Crude Oils by High-Resolution Spectrofluorimetry in Shpol'skii Matrices Sir: Many methods used in the investigation of nitrogencontaining polyaromatic compounds (azaarenes) in crude oils have benefited from continuous progress in analytical methodologies of neutral polycyclic aromatic hydrocarbons (PAH): high-performance liquid chromatography (1-3), UV spectrometry ( 4 ) ,and capillary column gas chromatography and combined gas chromatography/mass spectrometry (GC/MS) (5-11). Fluorescence analysis also appeared very early as a convenient and powerful method for PAH and azaarene analysis (12-14), due to both the exceptional fluorescence properties of these compounds and the great sensitivity of emission detection. However, at room temperature, fluorescence analysis does not permit the differentiation of isomeric compounds in complex mixtures because of considerable band broadening. Of much greater potentiality in this case is certainly the application of the Shpol'skii effect which is a specific characteristic of aromatic molecules (15). When incorporated a t low temperature ( T
